how much battery need for 2kv online ups for 2hr backup

3 Answers   Eaton, Emerson,

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what is iron loss?

4 Answers   RRB,

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What will be the minimum megger value of 1700 KVA Transformer? a) Do megger value varies according to climate conditions and area . b) If megger value is 100 mega ohm is it good for new transfomer. Explain?

4 Answers  

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how to calculate restraing current and operating current for differential protection if 20 mva transformer is OLTC 33 kv/11 kv ? and what should be the type and ratio of CT?

2 Answers   L&T, OPS,

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why we use primary delta connectin in hight voltage transformer

2 Answers  

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Can any one help me how to set an overload set the range from 2.8A to 4A , rated motor current 22A, CT 60/5A

2 Answers  

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what is the effect of leading power factor on Power transformers in existing in major power utility

2 Answers  

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In a overhead system why the voltage between line &ground is taken for basic comparison ?and in case of underground cables the comparison take only by the voltage between cables?

1 Answers   L&T,

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what is the formular for the calculation of CT'S when installed as part of a electrical installation so the correct meter is used

2 Answers  

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How to select busbar?

2 Answers  

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On a 6 KVA UPS we have to provide a DC MCB for Battery bank of 16 nos (12 V 42 AH). What Shall be the current rating of DC MCB ?

0 Answers   TNEB Tamil Nadu Electricity Board,

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What will happen if the d.c. Shunt motor opened accidentally running on no-load has its shunt field winding?

0 Answers  

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